A post-processing unit includes a stapler, a driving section, and a controller. The stapler is moved in a Y direction and executes a stapling process on a paper sheet. The driving section moves the stapler in the Y direction. The controller controls an operation of the stapler and an operation of the driving section. The controller executes first control to supply a set current or a set voltage to the driving section, second control to supply, to the driving section, the same supply current as the set current or the same supply voltage as the set voltage, and third control to stop the supply of the supply current or the supply voltage. When the stapler executes the stapling process a plurality of times, the controller repeatedly executes the second control and the third control and causes the stapler to execute the stapling process during the execution of the second control.

A mechanism that makes it possible to output a saddle-stitched brochure in a correct page order when a post-processing apparatus that executes a saddle-stitching process by switching back a sheet is caused to execute the saddle-stitching process. Sheets discharged from a printing apparatus are switched back by reverse rotation of a conveying roller pair, and are conveyed into a conveying path for a saddle-stitch bookbinding process. The sheets are accumulated in an accumulation tray for the saddle-stitch bookbinding process. When the saddle-stitch bookbinding process is caused to be executed on the accumulated sheets by the post-processing apparatus, the order of image formation is decided such that the order of pages of images printed on the saddle-stitched sheets becomes correct. The images are printed on the sheets in the decided order of image formation.

In accordance with an embodiment, a sheet binding device comprises a sheet shift section, a tape attaching section, an information acquisition section and a controller. The sheet shift section shifts a plurality of sheets forming a sheet bundle from each other at an edge of the sheet bundle. The tape attaching section attaches a tape to the edge of the sheet bundle. The information acquisition section acquires information relating to at least one of the plurality of the sheets, the tape, and a binding method of the sheet bundle by the tape. The controller changes a shift amount between sheets in the plurality of the sheets that is shifted by the sheet shift section based on the information acquired by the information acquisition section.

A sheet binding processing apparatus includes a conveying portion, a conveying path for sheets, a stacking portion on which sheets from the conveying path are stacked, a first regulating portion for regulating a sheet bundle on the stacking portion in a crossing direction, a second regulating portion for regulating a sheet bundle in the conveying direction, a manual setting portion for setting sheets from an outside of the apparatus, and a binding device which binds a sheet bundle by a staple and moves in the crossing direction. An angular posture of the binding device located at a third position is different from an angular posture located at a first position. An angular posture of the binding device located at the third position is different from an angular posture located at a second position. The second position is located at a second side of the first position.

An image forming system that is capable of forming an image onto a sheet on a basis of print image data including multiple image data items imposed in such a manner as to be suitable for middle-folding and saddle-stitching and outputting a booklet by performing middle-folding and saddle-stitching includes: a storing unit that stores beforehand, as an output-processing content table, an inclination direction of a compilation tray onto which a stack of sheets that is to be subjected to imposition processing for pages or a facing page of the booklet and the middle-folding and saddle-stitching is placed; and a processing unit that generates the print image data by acquiring information of the inclination direction of the compilation tray, referencing to the output-processing content table, and performing the imposition processing.

A sheet bonding apparatus includes an electrophotographic unit configured to apply powder adhesive on a sheet by an electrophotographic process, a folding portion configured to fold the sheet on which the powder adhesive has been applied by the electrophotographic unit, and a bonding portion configured to heat the sheet folded by the folding portion to bond the sheet by the powder adhesive, wherein the bonding portion and the folding portion are disposed over the electrophotographic unit.

A printing apparatus capable of conveying sheets to a sheet processing apparatus and to control the type of a sheet to be used as a cover sheet in a case where a book bound product is generated by switching back sheets each having an image printed, inverting the sheets and folding the inverted sheets, and to notify an error to a user based on the type of a sheet to be used as the cover sheet in a case where printing an image on the cover sheet is designated.

A post-processing apparatus includes a conveyor, a tray, a binder, and a binder mover. The conveyor conveys recording media on each of which an image is formed by an image forming apparatus. The tray holds the recording media conveyed by the conveyor. The binder binds the recording media on the tray with a plurality of staples in a cartridge. The binder mover includes a motor, a ratchet gear that receives a driving force of the motor to rotate in a forward direction or a reverse direction, a driving force transmitter that moves the binder toward one side in the main scanning direction as the ratchet gear rotates in the forward direction and moves the binder toward an opposite side in the main scanning direction as the ratchet gear rotates in the reverse direction, and a rotation limiter that moves between a rotation allowing position and a rotation limiting position.

A movable-member supporter includes: a first support member that includes a first support plate, a first guide unit provided at the first support plate, and a first connection section, the first guide unit guiding movement of a movable member and having one end that extends to one side surface of the first support plate, the first connection section being provided at the one side surface of the first support plate; and a second support member that includes a second support plate, a second guide unit provided at the second support plate, and a second connection section, the second guide unit guiding movement of the movable member and having one end that extends to one side surface of the second support plate, the second connection section being provided at the one side surface of the second support plate and being connected with the first connection section of the first support member.

A sheet processing apparatus includes a conveying portion, a conveying path, a discharge port, a stacking portion, a manual setting portion, a binding device which binds a sheet bundle formed by the stacking portion and a sheet bundle set at the manual setting portion by a staple, a first regulating portion which regulates a position of the sheet bundle at a rear side of the apparatus in a width direction, and a second regulating portion which regulates a position of the sheet bundle in the conveying direction. The binding device is formed to be movable back and forth to a front side and the rear side of the apparatus. When a staple is replenished to the binding device, the binding device is positioned at the third position so that a cartridge of the staple is loaded into the binding device from the front side of the apparatus.